New
New
Year 5

# Estimate and multiply a 2-digit by a 1-digit number using expanded and short multiplication

I can use expanded and short multiplication to multiply 2-digit by 1-digit numbers.

New
New
Year 5

# Estimate and multiply a 2-digit by a 1-digit number using expanded and short multiplication

I can use expanded and short multiplication to multiply 2-digit by 1-digit numbers.

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## Lesson details

### Key learning points

1. Use times tables and place value to estimate the product of a 2-digit by a 1-digit multiplication.
2. Use expanded short multiplication to multiply a 2-digit by a 1-digit number.
3. Use short multiplication to multiply a 2-digit by a 1-digit number.

### Common misconception

Pupils may find it difficult to identify the multiples of 10 a number is between when estimating.

Provide a number line and continue to use stem sentences to support pupils in their thinking.

### Keywords

• Estimation - To find a value that is close enough to the right answer, usually with some thought or calculation involved is known as estimation.

Estimation is a key skill and should be modelled clearly, with pupils encouraged to use estimation at every opportunity. Take time to model your 'thinking aloud' process while estimating.
Teacher tip

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
483 can be partitioned as __________.
4 tens, 8 tens and 3 ones.
4 hundreds, 7 tens and 3 ones.
Correct answer: 4 hundreds, 8 tens and 3 ones.
4 hundreds, 80 tens and 3 ones.
Q2.
Izzy is chanting her 7 times tables: ... 21, 28, 35, ___. What comes next?
40
41
43
Q3.
Izzy is chanting her 7 times tables in descending order: ... 77, 70, 63, . What comes next?
Correct Answer: 56, fifty-six, Fifty-six, Fifty six
Q4.
Use short multiplication to calculate this question: 56 × 3 =
Correct Answer: 168, one hundred and sixty eight, One hundred and sixty eight
Q5.
Use expanded multiplication to calculate this question: 74 × 5=
Correct Answer: 370, Three hundred and seventy, three hundred and seventy
Q6.
Sam has 71 shiny cards, Izzy has 213 shiny cards. Izzy has times as many.

## Exit quiz

### 6 Questions

Q1.
To estimate for the calculation: 4 × 72, 72 is between __________.
60 and 70
65 and 70
Q2.
Select the correct number to complete the estimation.
28
74
208
Q3.
Write the correct number to complete the estimation.
Correct Answer: 360, Three hundred and sixty, three hundred and sixty
Q4.
Select an appropriate estimation for 63 × 3
65 × 3